define(function(require, exports, module) {
    
    var $ = require('$');
    var jQuery = $;
  //! moment.js
  //! version : 2.5.1
  //! authors : Tim Wood, Iskren Chernev, Moment.js contributors
  //! license : MIT
  //! momentjs.com

  (function (undefined) {

      /************************************
          Constants
      ************************************/

      var moment,
          VERSION = "2.5.1",
          global = this,
          round = Math.round,
          i,

          YEAR = 0,
          MONTH = 1,
          DATE = 2,
          HOUR = 3,
          MINUTE = 4,
          SECOND = 5,
          MILLISECOND = 6,

          // internal storage for language config files
          languages = {},

          // moment internal properties
          momentProperties = {
              _isAMomentObject: null,
              _i : null,
              _f : null,
              _l : null,
              _strict : null,
              _isUTC : null,
              _offset : null,  // optional. Combine with _isUTC
              _pf : null,
              _lang : null  // optional
          },

          // check for nodeJS
          hasModule = (typeof module !== 'undefined' && module.exports && typeof require !== 'undefined'),

          // ASP.NET json date format regex
          aspNetJsonRegex = /^\/?Date\((\-?\d+)/i,
          aspNetTimeSpanJsonRegex = /(\-)?(?:(\d*)\.)?(\d+)\:(\d+)(?:\:(\d+)\.?(\d{3})?)?/,

          // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
          // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
          isoDurationRegex = /^(-)?P(?:(?:([0-9,.]*)Y)?(?:([0-9,.]*)M)?(?:([0-9,.]*)D)?(?:T(?:([0-9,.]*)H)?(?:([0-9,.]*)M)?(?:([0-9,.]*)S)?)?|([0-9,.]*)W)$/,

          // format tokens
          formattingTokens = /(\[[^\[]*\])|(\\)?(Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|YYYYYY|YYYYY|YYYY|YY|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|mm?|ss?|S{1,4}|X|zz?|ZZ?|.)/g,
          localFormattingTokens = /(\[[^\[]*\])|(\\)?(LT|LL?L?L?|l{1,4})/g,

          // parsing token regexes
          parseTokenOneOrTwoDigits = /\d\d?/, // 0 - 99
          parseTokenOneToThreeDigits = /\d{1,3}/, // 0 - 999
          parseTokenOneToFourDigits = /\d{1,4}/, // 0 - 9999
          parseTokenOneToSixDigits = /[+\-]?\d{1,6}/, // -999,999 - 999,999
          parseTokenDigits = /\d+/, // nonzero number of digits
          parseTokenWord = /[0-9]*['a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+|[\u0600-\u06FF\/]+(\s*?[\u0600-\u06FF]+){1,2}/i, // any word (or two) characters or numbers including two/three word month in arabic.
          parseTokenTimezone = /Z|[\+\-]\d\d:?\d\d/gi, // +00:00 -00:00 +0000 -0000 or Z
          parseTokenT = /T/i, // T (ISO separator)
          parseTokenTimestampMs = /[\+\-]?\d+(\.\d{1,3})?/, // 123456789 123456789.123

          //strict parsing regexes
          parseTokenOneDigit = /\d/, // 0 - 9
          parseTokenTwoDigits = /\d\d/, // 00 - 99
          parseTokenThreeDigits = /\d{3}/, // 000 - 999
          parseTokenFourDigits = /\d{4}/, // 0000 - 9999
          parseTokenSixDigits = /[+-]?\d{6}/, // -999,999 - 999,999
          parseTokenSignedNumber = /[+-]?\d+/, // -inf - inf

          // iso 8601 regex
          // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)
          isoRegex = /^\s*(?:[+-]\d{6}|\d{4})-(?:(\d\d-\d\d)|(W\d\d$)|(W\d\d-\d)|(\d\d\d))((T| )(\d\d(:\d\d(:\d\d(\.\d+)?)?)?)?([\+\-]\d\d(?::?\d\d)?|\s*Z)?)?$/,

          isoFormat = 'YYYY-MM-DDTHH:mm:ssZ',

          isoDates = [
              ['YYYYYY-MM-DD', /[+-]\d{6}-\d{2}-\d{2}/],
              ['YYYY-MM-DD', /\d{4}-\d{2}-\d{2}/],
              ['GGGG-[W]WW-E', /\d{4}-W\d{2}-\d/],
              ['GGGG-[W]WW', /\d{4}-W\d{2}/],
              ['YYYY-DDD', /\d{4}-\d{3}/]
          ],

          // iso time formats and regexes
          isoTimes = [
              ['HH:mm:ss.SSSS', /(T| )\d\d:\d\d:\d\d\.\d{1,3}/],
              ['HH:mm:ss', /(T| )\d\d:\d\d:\d\d/],
              ['HH:mm', /(T| )\d\d:\d\d/],
              ['HH', /(T| )\d\d/]
          ],

          // timezone chunker "+10:00" > ["10", "00"] or "-1530" > ["-15", "30"]
          parseTimezoneChunker = /([\+\-]|\d\d)/gi,

          // getter and setter names
          proxyGettersAndSetters = 'Date|Hours|Minutes|Seconds|Milliseconds'.split('|'),
          unitMillisecondFactors = {
              'Milliseconds' : 1,
              'Seconds' : 1e3,
              'Minutes' : 6e4,
              'Hours' : 36e5,
              'Days' : 864e5,
              'Months' : 2592e6,
              'Years' : 31536e6
          },

          unitAliases = {
              ms : 'millisecond',
              s : 'second',
              m : 'minute',
              h : 'hour',
              d : 'day',
              D : 'date',
              w : 'week',
              W : 'isoWeek',
              M : 'month',
              y : 'year',
              DDD : 'dayOfYear',
              e : 'weekday',
              E : 'isoWeekday',
              gg: 'weekYear',
              GG: 'isoWeekYear'
          },

          camelFunctions = {
              dayofyear : 'dayOfYear',
              isoweekday : 'isoWeekday',
              isoweek : 'isoWeek',
              weekyear : 'weekYear',
              isoweekyear : 'isoWeekYear'
          },

          // format function strings
          formatFunctions = {},

          // tokens to ordinalize and pad
          ordinalizeTokens = 'DDD w W M D d'.split(' '),
          paddedTokens = 'M D H h m s w W'.split(' '),

          formatTokenFunctions = {
              M    : function () {
                  return this.month() + 1;
              },
              MMM  : function (format) {
                  return this.lang().monthsShort(this, format);
              },
              MMMM : function (format) {
                  return this.lang().months(this, format);
              },
              D    : function () {
                  return this.date();
              },
              DDD  : function () {
                  return this.dayOfYear();
              },
              d    : function () {
                  return this.day();
              },
              dd   : function (format) {
                  return this.lang().weekdaysMin(this, format);
              },
              ddd  : function (format) {
                  return this.lang().weekdaysShort(this, format);
              },
              dddd : function (format) {
                  return this.lang().weekdays(this, format);
              },
              w    : function () {
                  return this.week();
              },
              W    : function () {
                  return this.isoWeek();
              },
              YY   : function () {
                  return leftZeroFill(this.year() % 100, 2);
              },
              YYYY : function () {
                  return leftZeroFill(this.year(), 4);
              },
              YYYYY : function () {
                  return leftZeroFill(this.year(), 5);
              },
              YYYYYY : function () {
                  var y = this.year(), sign = y >= 0 ? '+' : '-';
                  return sign + leftZeroFill(Math.abs(y), 6);
              },
              gg   : function () {
                  return leftZeroFill(this.weekYear() % 100, 2);
              },
              gggg : function () {
                  return leftZeroFill(this.weekYear(), 4);
              },
              ggggg : function () {
                  return leftZeroFill(this.weekYear(), 5);
              },
              GG   : function () {
                  return leftZeroFill(this.isoWeekYear() % 100, 2);
              },
              GGGG : function () {
                  return leftZeroFill(this.isoWeekYear(), 4);
              },
              GGGGG : function () {
                  return leftZeroFill(this.isoWeekYear(), 5);
              },
              e : function () {
                  return this.weekday();
              },
              E : function () {
                  return this.isoWeekday();
              },
              a    : function () {
                  return this.lang().meridiem(this.hours(), this.minutes(), true);
              },
              A    : function () {
                  return this.lang().meridiem(this.hours(), this.minutes(), false);
              },
              H    : function () {
                  return this.hours();
              },
              h    : function () {
                  return this.hours() % 12 || 12;
              },
              m    : function () {
                  return this.minutes();
              },
              s    : function () {
                  return this.seconds();
              },
              S    : function () {
                  return toInt(this.milliseconds() / 100);
              },
              SS   : function () {
                  return leftZeroFill(toInt(this.milliseconds() / 10), 2);
              },
              SSS  : function () {
                  return leftZeroFill(this.milliseconds(), 3);
              },
              SSSS : function () {
                  return leftZeroFill(this.milliseconds(), 3);
              },
              Z    : function () {
                  var a = -this.zone(),
                      b = "+";
                  if (a < 0) {
                      a = -a;
                      b = "-";
                  }
                  return b + leftZeroFill(toInt(a / 60), 2) + ":" + leftZeroFill(toInt(a) % 60, 2);
              },
              ZZ   : function () {
                  var a = -this.zone(),
                      b = "+";
                  if (a < 0) {
                      a = -a;
                      b = "-";
                  }
                  return b + leftZeroFill(toInt(a / 60), 2) + leftZeroFill(toInt(a) % 60, 2);
              },
              z : function () {
                  return this.zoneAbbr();
              },
              zz : function () {
                  return this.zoneName();
              },
              X    : function () {
                  return this.unix();
              },
              Q : function () {
                  return this.quarter();
              }
          },

          lists = ['months', 'monthsShort', 'weekdays', 'weekdaysShort', 'weekdaysMin'];

      function defaultParsingFlags() {
          // We need to deep clone this object, and es5 standard is not very
          // helpful.
          return {
              empty : false,
              unusedTokens : [],
              unusedInput : [],
              overflow : -2,
              charsLeftOver : 0,
              nullInput : false,
              invalidMonth : null,
              invalidFormat : false,
              userInvalidated : false,
              iso: false
          };
      }

      function padToken(func, count) {
          return function (a) {
              return leftZeroFill(func.call(this, a), count);
          };
      }
      function ordinalizeToken(func, period) {
          return function (a) {
              return this.lang().ordinal(func.call(this, a), period);
          };
      }

      while (ordinalizeTokens.length) {
          i = ordinalizeTokens.pop();
          formatTokenFunctions[i + 'o'] = ordinalizeToken(formatTokenFunctions[i], i);
      }
      while (paddedTokens.length) {
          i = paddedTokens.pop();
          formatTokenFunctions[i + i] = padToken(formatTokenFunctions[i], 2);
      }
      formatTokenFunctions.DDDD = padToken(formatTokenFunctions.DDD, 3);


      /************************************
          Constructors
      ************************************/

      function Language() {

      }

      // Moment prototype object
      function Moment(config) {
          checkOverflow(config);
          extend(this, config);
      }

      // Duration Constructor
      function Duration(duration) {
          var normalizedInput = normalizeObjectUnits(duration),
              years = normalizedInput.year || 0,
              months = normalizedInput.month || 0,
              weeks = normalizedInput.week || 0,
              days = normalizedInput.day || 0,
              hours = normalizedInput.hour || 0,
              minutes = normalizedInput.minute || 0,
              seconds = normalizedInput.second || 0,
              milliseconds = normalizedInput.millisecond || 0;

          // representation for dateAddRemove
          this._milliseconds = +milliseconds +
              seconds * 1e3 + // 1000
              minutes * 6e4 + // 1000 * 60
              hours * 36e5; // 1000 * 60 * 60
          // Because of dateAddRemove treats 24 hours as different from a
          // day when working around DST, we need to store them separately
          this._days = +days +
              weeks * 7;
          // It is impossible translate months into days without knowing
          // which months you are are talking about, so we have to store
          // it separately.
          this._months = +months +
              years * 12;

          this._data = {};

          this._bubble();
      }

      /************************************
          Helpers
      ************************************/


      function extend(a, b) {
          for (var i in b) {
              if (b.hasOwnProperty(i)) {
                  a[i] = b[i];
              }
          }

          if (b.hasOwnProperty("toString")) {
              a.toString = b.toString;
          }

          if (b.hasOwnProperty("valueOf")) {
              a.valueOf = b.valueOf;
          }

          return a;
      }

      function cloneMoment(m) {
          var result = {}, i;
          for (i in m) {
              if (m.hasOwnProperty(i) && momentProperties.hasOwnProperty(i)) {
                  result[i] = m[i];
              }
          }

          return result;
      }

      function absRound(number) {
          if (number < 0) {
              return Math.ceil(number);
          } else {
              return Math.floor(number);
          }
      }

      // left zero fill a number
      // see http://jsperf.com/left-zero-filling for performance comparison
      function leftZeroFill(number, targetLength, forceSign) {
          var output = '' + Math.abs(number),
              sign = number >= 0;

          while (output.length < targetLength) {
              output = '0' + output;
          }
          return (sign ? (forceSign ? '+' : '') : '-') + output;
      }

      // helper function for _.addTime and _.subtractTime
      function addOrSubtractDurationFromMoment(mom, duration, isAdding, ignoreUpdateOffset) {
          var milliseconds = duration._milliseconds,
              days = duration._days,
              months = duration._months,
              minutes,
              hours;

          if (milliseconds) {
              mom._d.setTime(+mom._d + milliseconds * isAdding);
          }
          // store the minutes and hours so we can restore them
          if (days || months) {
              minutes = mom.minute();
              hours = mom.hour();
          }
          if (days) {
              mom.date(mom.date() + days * isAdding);
          }
          if (months) {
              mom.month(mom.month() + months * isAdding);
          }
          if (milliseconds && !ignoreUpdateOffset) {
              moment.updateOffset(mom);
          }
          // restore the minutes and hours after possibly changing dst
          if (days || months) {
              mom.minute(minutes);
              mom.hour(hours);
          }
      }

      // check if is an array
      function isArray(input) {
          return Object.prototype.toString.call(input) === '[object Array]';
      }

      function isDate(input) {
          return  Object.prototype.toString.call(input) === '[object Date]' ||
                  input instanceof Date;
      }

      // compare two arrays, return the number of differences
      function compareArrays(array1, array2, dontConvert) {
          var len = Math.min(array1.length, array2.length),
              lengthDiff = Math.abs(array1.length - array2.length),
              diffs = 0,
              i;
          for (i = 0; i < len; i++) {
              if ((dontConvert && array1[i] !== array2[i]) ||
                  (!dontConvert && toInt(array1[i]) !== toInt(array2[i]))) {
                  diffs++;
              }
          }
          return diffs + lengthDiff;
      }

      function normalizeUnits(units) {
          if (units) {
              var lowered = units.toLowerCase().replace(/(.)s$/, '$1');
              units = unitAliases[units] || camelFunctions[lowered] || lowered;
          }
          return units;
      }

      function normalizeObjectUnits(inputObject) {
          var normalizedInput = {},
              normalizedProp,
              prop;

          for (prop in inputObject) {
              if (inputObject.hasOwnProperty(prop)) {
                  normalizedProp = normalizeUnits(prop);
                  if (normalizedProp) {
                      normalizedInput[normalizedProp] = inputObject[prop];
                  }
              }
          }

          return normalizedInput;
      }

      function makeList(field) {
          var count, setter;

          if (field.indexOf('week') === 0) {
              count = 7;
              setter = 'day';
          }
          else if (field.indexOf('month') === 0) {
              count = 12;
              setter = 'month';
          }
          else {
              return;
          }

          moment[field] = function (format, index) {
              var i, getter,
                  method = moment.fn._lang[field],
                  results = [];

              if (typeof format === 'number') {
                  index = format;
                  format = undefined;
              }

              getter = function (i) {
                  var m = moment().utc().set(setter, i);
                  return method.call(moment.fn._lang, m, format || '');
              };

              if (index != null) {
                  return getter(index);
              }
              else {
                  for (i = 0; i < count; i++) {
                      results.push(getter(i));
                  }
                  return results;
              }
          };
      }

      function toInt(argumentForCoercion) {
          var coercedNumber = +argumentForCoercion,
              value = 0;

          if (coercedNumber !== 0 && isFinite(coercedNumber)) {
              if (coercedNumber >= 0) {
                  value = Math.floor(coercedNumber);
              } else {
                  value = Math.ceil(coercedNumber);
              }
          }

          return value;
      }

      function daysInMonth(year, month) {
          return new Date(Date.UTC(year, month + 1, 0)).getUTCDate();
      }

      function daysInYear(year) {
          return isLeapYear(year) ? 366 : 365;
      }

      function isLeapYear(year) {
          return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
      }

      function checkOverflow(m) {
          var overflow;
          if (m._a && m._pf.overflow === -2) {
              overflow =
                  m._a[MONTH] < 0 || m._a[MONTH] > 11 ? MONTH :
                  m._a[DATE] < 1 || m._a[DATE] > daysInMonth(m._a[YEAR], m._a[MONTH]) ? DATE :
                  m._a[HOUR] < 0 || m._a[HOUR] > 23 ? HOUR :
                  m._a[MINUTE] < 0 || m._a[MINUTE] > 59 ? MINUTE :
                  m._a[SECOND] < 0 || m._a[SECOND] > 59 ? SECOND :
                  m._a[MILLISECOND] < 0 || m._a[MILLISECOND] > 999 ? MILLISECOND :
                  -1;

              if (m._pf._overflowDayOfYear && (overflow < YEAR || overflow > DATE)) {
                  overflow = DATE;
              }

              m._pf.overflow = overflow;
          }
      }

      function isValid(m) {
          if (m._isValid == null) {
              m._isValid = !isNaN(m._d.getTime()) &&
                  m._pf.overflow < 0 &&
                  !m._pf.empty &&
                  !m._pf.invalidMonth &&
                  !m._pf.nullInput &&
                  !m._pf.invalidFormat &&
                  !m._pf.userInvalidated;

              if (m._strict) {
                  m._isValid = m._isValid &&
                      m._pf.charsLeftOver === 0 &&
                      m._pf.unusedTokens.length === 0;
              }
          }
          return m._isValid;
      }

      function normalizeLanguage(key) {
          return key ? key.toLowerCase().replace('_', '-') : key;
      }

      // Return a moment from input, that is local/utc/zone equivalent to model.
      function makeAs(input, model) {
          return model._isUTC ? moment(input).zone(model._offset || 0) :
              moment(input).local();
      }

      /************************************
          Languages
      ************************************/


      extend(Language.prototype, {

          set : function (config) {
              var prop, i;
              for (i in config) {
                  prop = config[i];
                  if (typeof prop === 'function') {
                      this[i] = prop;
                  } else {
                      this['_' + i] = prop;
                  }
              }
          },

          _months : "January_February_March_April_May_June_July_August_September_October_November_December".split("_"),
          months : function (m) {
              return this._months[m.month()];
          },

          _monthsShort : "Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec".split("_"),
          monthsShort : function (m) {
              return this._monthsShort[m.month()];
          },

          monthsParse : function (monthName) {
              var i, mom, regex;

              if (!this._monthsParse) {
                  this._monthsParse = [];
              }

              for (i = 0; i < 12; i++) {
                  // make the regex if we don't have it already
                  if (!this._monthsParse[i]) {
                      mom = moment.utc([2000, i]);
                      regex = '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '');
                      this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i');
                  }
                  // test the regex
                  if (this._monthsParse[i].test(monthName)) {
                      return i;
                  }
              }
          },

          _weekdays : "Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday".split("_"),
          weekdays : function (m) {
              return this._weekdays[m.day()];
          },

          _weekdaysShort : "Sun_Mon_Tue_Wed_Thu_Fri_Sat".split("_"),
          weekdaysShort : function (m) {
              return this._weekdaysShort[m.day()];
          },

          _weekdaysMin : "Su_Mo_Tu_We_Th_Fr_Sa".split("_"),
          weekdaysMin : function (m) {
              return this._weekdaysMin[m.day()];
          },

          weekdaysParse : function (weekdayName) {
              var i, mom, regex;

              if (!this._weekdaysParse) {
                  this._weekdaysParse = [];
              }

              for (i = 0; i < 7; i++) {
                  // make the regex if we don't have it already
                  if (!this._weekdaysParse[i]) {
                      mom = moment([2000, 1]).day(i);
                      regex = '^' + this.weekdays(mom, '') + '|^' + this.weekdaysShort(mom, '') + '|^' + this.weekdaysMin(mom, '');
                      this._weekdaysParse[i] = new RegExp(regex.replace('.', ''), 'i');
                  }
                  // test the regex
                  if (this._weekdaysParse[i].test(weekdayName)) {
                      return i;
                  }
              }
          },

          _longDateFormat : {
              LT : "h:mm A",
              L : "MM/DD/YYYY",
              LL : "MMMM D YYYY",
              LLL : "MMMM D YYYY LT",
              LLLL : "dddd, MMMM D YYYY LT"
          },
          longDateFormat : function (key) {
              var output = this._longDateFormat[key];
              if (!output && this._longDateFormat[key.toUpperCase()]) {
                  output = this._longDateFormat[key.toUpperCase()].replace(/MMMM|MM|DD|dddd/g, function (val) {
                      return val.slice(1);
                  });
                  this._longDateFormat[key] = output;
              }
              return output;
          },

          isPM : function (input) {
              // IE8 Quirks Mode & IE7 Standards Mode do not allow accessing strings like arrays
              // Using charAt should be more compatible.
              return ((input + '').toLowerCase().charAt(0) === 'p');
          },

          _meridiemParse : /[ap]\.?m?\.?/i,
          meridiem : function (hours, minutes, isLower) {
              if (hours > 11) {
                  return isLower ? 'pm' : 'PM';
              } else {
                  return isLower ? 'am' : 'AM';
              }
          },

          _calendar : {
              sameDay : '[Today at] LT',
              nextDay : '[Tomorrow at] LT',
              nextWeek : 'dddd [at] LT',
              lastDay : '[Yesterday at] LT',
              lastWeek : '[Last] dddd [at] LT',
              sameElse : 'L'
          },
          calendar : function (key, mom) {
              var output = this._calendar[key];
              return typeof output === 'function' ? output.apply(mom) : output;
          },

          _relativeTime : {
              future : "in %s",
              past : "%s ago",
              s : "a few seconds",
              m : "a minute",
              mm : "%d minutes",
              h : "an hour",
              hh : "%d hours",
              d : "a day",
              dd : "%d days",
              M : "a month",
              MM : "%d months",
              y : "a year",
              yy : "%d years"
          },
          relativeTime : function (number, withoutSuffix, string, isFuture) {
              var output = this._relativeTime[string];
              return (typeof output === 'function') ?
                  output(number, withoutSuffix, string, isFuture) :
                  output.replace(/%d/i, number);
          },
          pastFuture : function (diff, output) {
              var format = this._relativeTime[diff > 0 ? 'future' : 'past'];
              return typeof format === 'function' ? format(output) : format.replace(/%s/i, output);
          },

          ordinal : function (number) {
              return this._ordinal.replace("%d", number);
          },
          _ordinal : "%d",

          preparse : function (string) {
              return string;
          },

          postformat : function (string) {
              return string;
          },

          week : function (mom) {
              return weekOfYear(mom, this._week.dow, this._week.doy).week;
          },

          _week : {
              dow : 0, // Sunday is the first day of the week.
              doy : 6  // The week that contains Jan 1st is the first week of the year.
          },

          _invalidDate: 'Invalid date',
          invalidDate: function () {
              return this._invalidDate;
          }
      });

      // Loads a language definition into the `languages` cache.  The function
      // takes a key and optionally values.  If not in the browser and no values
      // are provided, it will load the language file module.  As a convenience,
      // this function also returns the language values.
      function loadLang(key, values) {
          values.abbr = key;
          if (!languages[key]) {
              languages[key] = new Language();
          }
          languages[key].set(values);
          return languages[key];
      }

      // Remove a language from the `languages` cache. Mostly useful in tests.
      function unloadLang(key) {
          delete languages[key];
      }

      // Determines which language definition to use and returns it.
      //
      // With no parameters, it will return the global language.  If you
      // pass in a language key, such as 'en', it will return the
      // definition for 'en', so long as 'en' has already been loaded using
      // moment.lang.
      function getLangDefinition(key) {
          var i = 0, j, lang, next, split,
              get = function (k) {
                  if (!languages[k] && hasModule) {
                      try {
                          require('./lang/' + k);
                      } catch (e) { }
                  }
                  return languages[k];
              };

          if (!key) {
              return moment.fn._lang;
          }

          if (!isArray(key)) {
              //short-circuit everything else
              lang = get(key);
              if (lang) {
                  return lang;
              }
              key = [key];
          }

          //pick the language from the array
          //try ['en-au', 'en-gb'] as 'en-au', 'en-gb', 'en', as in move through the list trying each
          //substring from most specific to least, but move to the next array item if it's a more specific variant than the current root
          while (i < key.length) {
              split = normalizeLanguage(key[i]).split('-');
              j = split.length;
              next = normalizeLanguage(key[i + 1]);
              next = next ? next.split('-') : null;
              while (j > 0) {
                  lang = get(split.slice(0, j).join('-'));
                  if (lang) {
                      return lang;
                  }
                  if (next && next.length >= j && compareArrays(split, next, true) >= j - 1) {
                      //the next array item is better than a shallower substring of this one
                      break;
                  }
                  j--;
              }
              i++;
          }
          return moment.fn._lang;
      }

      /************************************
          Formatting
      ************************************/


      function removeFormattingTokens(input) {
          if (input.match(/\[[\s\S]/)) {
              return input.replace(/^\[|\]$/g, "");
          }
          return input.replace(/\\/g, "");
      }

      function makeFormatFunction(format) {
          var array = format.match(formattingTokens), i, length;

          for (i = 0, length = array.length; i < length; i++) {
              if (formatTokenFunctions[array[i]]) {
                  array[i] = formatTokenFunctions[array[i]];
              } else {
                  array[i] = removeFormattingTokens(array[i]);
              }
          }

          return function (mom) {
              var output = "";
              for (i = 0; i < length; i++) {
                  output += array[i] instanceof Function ? array[i].call(mom, format) : array[i];
              }
              return output;
          };
      }

      // format date using native date object
      function formatMoment(m, format) {

          if (!m.isValid()) {
              return m.lang().invalidDate();
          }

          format = expandFormat(format, m.lang());

          if (!formatFunctions[format]) {
              formatFunctions[format] = makeFormatFunction(format);
          }

          return formatFunctions[format](m);
      }

      function expandFormat(format, lang) {
          var i = 5;

          function replaceLongDateFormatTokens(input) {
              return lang.longDateFormat(input) || input;
          }

          localFormattingTokens.lastIndex = 0;
          while (i >= 0 && localFormattingTokens.test(format)) {
              format = format.replace(localFormattingTokens, replaceLongDateFormatTokens);
              localFormattingTokens.lastIndex = 0;
              i -= 1;
          }

          return format;
      }


      /************************************
          Parsing
      ************************************/


      // get the regex to find the next token
      function getParseRegexForToken(token, config) {
          var a, strict = config._strict;
          switch (token) {
          case 'DDDD':
              return parseTokenThreeDigits;
          case 'YYYY':
          case 'GGGG':
          case 'gggg':
              return strict ? parseTokenFourDigits : parseTokenOneToFourDigits;
          case 'Y':
          case 'G':
          case 'g':
              return parseTokenSignedNumber;
          case 'YYYYYY':
          case 'YYYYY':
          case 'GGGGG':
          case 'ggggg':
              return strict ? parseTokenSixDigits : parseTokenOneToSixDigits;
          case 'S':
              if (strict) { return parseTokenOneDigit; }
              /* falls through */
          case 'SS':
              if (strict) { return parseTokenTwoDigits; }
              /* falls through */
          case 'SSS':
              if (strict) { return parseTokenThreeDigits; }
              /* falls through */
          case 'DDD':
              return parseTokenOneToThreeDigits;
          case 'MMM':
          case 'MMMM':
          case 'dd':
          case 'ddd':
          case 'dddd':
              return parseTokenWord;
          case 'a':
          case 'A':
              return getLangDefinition(config._l)._meridiemParse;
          case 'X':
              return parseTokenTimestampMs;
          case 'Z':
          case 'ZZ':
              return parseTokenTimezone;
          case 'T':
              return parseTokenT;
          case 'SSSS':
              return parseTokenDigits;
          case 'MM':
          case 'DD':
          case 'YY':
          case 'GG':
          case 'gg':
          case 'HH':
          case 'hh':
          case 'mm':
          case 'ss':
          case 'ww':
          case 'WW':
              return strict ? parseTokenTwoDigits : parseTokenOneOrTwoDigits;
          case 'M':
          case 'D':
          case 'd':
          case 'H':
          case 'h':
          case 'm':
          case 's':
          case 'w':
          case 'W':
          case 'e':
          case 'E':
              return parseTokenOneOrTwoDigits;
          default :
              a = new RegExp(regexpEscape(unescapeFormat(token.replace('\\', '')), "i"));
              return a;
          }
      }

      function timezoneMinutesFromString(string) {
          string = string || "";
          var possibleTzMatches = (string.match(parseTokenTimezone) || []),
              tzChunk = possibleTzMatches[possibleTzMatches.length - 1] || [],
              parts = (tzChunk + '').match(parseTimezoneChunker) || ['-', 0, 0],
              minutes = +(parts[1] * 60) + toInt(parts[2]);

          return parts[0] === '+' ? -minutes : minutes;
      }

      // function to convert string input to date
      function addTimeToArrayFromToken(token, input, config) {
          var a, datePartArray = config._a;

          switch (token) {
          // MONTH
          case 'M' : // fall through to MM
          case 'MM' :
              if (input != null) {
                  datePartArray[MONTH] = toInt(input) - 1;
              }
              break;
          case 'MMM' : // fall through to MMMM
          case 'MMMM' :
              a = getLangDefinition(config._l).monthsParse(input);
              // if we didn't find a month name, mark the date as invalid.
              if (a != null) {
                  datePartArray[MONTH] = a;
              } else {
                  config._pf.invalidMonth = input;
              }
              break;
          // DAY OF MONTH
          case 'D' : // fall through to DD
          case 'DD' :
              if (input != null) {
                  datePartArray[DATE] = toInt(input);
              }
              break;
          // DAY OF YEAR
          case 'DDD' : // fall through to DDDD
          case 'DDDD' :
              if (input != null) {
                  config._dayOfYear = toInt(input);
              }

              break;
          // YEAR
          case 'YY' :
              datePartArray[YEAR] = toInt(input) + (toInt(input) > 68 ? 1900 : 2000);
              break;
          case 'YYYY' :
          case 'YYYYY' :
          case 'YYYYYY' :
              datePartArray[YEAR] = toInt(input);
              break;
          // AM / PM
          case 'a' : // fall through to A
          case 'A' :
              config._isPm = getLangDefinition(config._l).isPM(input);
              break;
          // 24 HOUR
          case 'H' : // fall through to hh
          case 'HH' : // fall through to hh
          case 'h' : // fall through to hh
          case 'hh' :
              datePartArray[HOUR] = toInt(input);
              break;
          // MINUTE
          case 'm' : // fall through to mm
          case 'mm' :
              datePartArray[MINUTE] = toInt(input);
              break;
          // SECOND
          case 's' : // fall through to ss
          case 'ss' :
              datePartArray[SECOND] = toInt(input);
              break;
          // MILLISECOND
          case 'S' :
          case 'SS' :
          case 'SSS' :
          case 'SSSS' :
              datePartArray[MILLISECOND] = toInt(('0.' + input) * 1000);
              break;
          // UNIX TIMESTAMP WITH MS
          case 'X':
              config._d = new Date(parseFloat(input) * 1000);
              break;
          // TIMEZONE
          case 'Z' : // fall through to ZZ
          case 'ZZ' :
              config._useUTC = true;
              config._tzm = timezoneMinutesFromString(input);
              break;
          case 'w':
          case 'ww':
          case 'W':
          case 'WW':
          case 'd':
          case 'dd':
          case 'ddd':
          case 'dddd':
          case 'e':
          case 'E':
              token = token.substr(0, 1);
              /* falls through */
          case 'gg':
          case 'gggg':
          case 'GG':
          case 'GGGG':
          case 'GGGGG':
              token = token.substr(0, 2);
              if (input) {
                  config._w = config._w || {};
                  config._w[token] = input;
              }
              break;
          }
      }

      // convert an array to a date.
      // the array should mirror the parameters below
      // note: all values past the year are optional and will default to the lowest possible value.
      // [year, month, day , hour, minute, second, millisecond]
      function dateFromConfig(config) {
          var i, date, input = [], currentDate,
              yearToUse, fixYear, w, temp, lang, weekday, week;

          if (config._d) {
              return;
          }

          currentDate = currentDateArray(config);

          //compute day of the year from weeks and weekdays
          if (config._w && config._a[DATE] == null && config._a[MONTH] == null) {
              fixYear = function (val) {
                  var int_val = parseInt(val, 10);
                  return val ?
                    (val.length < 3 ? (int_val > 68 ? 1900 + int_val : 2000 + int_val) : int_val) :
                    (config._a[YEAR] == null ? moment().weekYear() : config._a[YEAR]);
              };

              w = config._w;
              if (w.GG != null || w.W != null || w.E != null) {
                  temp = dayOfYearFromWeeks(fixYear(w.GG), w.W || 1, w.E, 4, 1);
              }
              else {
                  lang = getLangDefinition(config._l);
                  weekday = w.d != null ?  parseWeekday(w.d, lang) :
                    (w.e != null ?  parseInt(w.e, 10) + lang._week.dow : 0);

                  week = parseInt(w.w, 10) || 1;

                  //if we're parsing 'd', then the low day numbers may be next week
                  if (w.d != null && weekday < lang._week.dow) {
                      week++;
                  }

                  temp = dayOfYearFromWeeks(fixYear(w.gg), week, weekday, lang._week.doy, lang._week.dow);
              }

              config._a[YEAR] = temp.year;
              config._dayOfYear = temp.dayOfYear;
          }

          //if the day of the year is set, figure out what it is
          if (config._dayOfYear) {
              yearToUse = config._a[YEAR] == null ? currentDate[YEAR] : config._a[YEAR];

              if (config._dayOfYear > daysInYear(yearToUse)) {
                  config._pf._overflowDayOfYear = true;
              }

              date = makeUTCDate(yearToUse, 0, config._dayOfYear);
              config._a[MONTH] = date.getUTCMonth();
              config._a[DATE] = date.getUTCDate();
          }

          // Default to current date.
          // * if no year, month, day of month are given, default to today
          // * if day of month is given, default month and year
          // * if month is given, default only year
          // * if year is given, don't default anything
          for (i = 0; i < 3 && config._a[i] == null; ++i) {
              config._a[i] = input[i] = currentDate[i];
          }

          // Zero out whatever was not defaulted, including time
          for (; i < 7; i++) {
              config._a[i] = input[i] = (config._a[i] == null) ? (i === 2 ? 1 : 0) : config._a[i];
          }

          // add the offsets to the time to be parsed so that we can have a clean array for checking isValid
          input[HOUR] += toInt((config._tzm || 0) / 60);
          input[MINUTE] += toInt((config._tzm || 0) % 60);

          config._d = (config._useUTC ? makeUTCDate : makeDate).apply(null, input);
      }

      function dateFromObject(config) {
          var normalizedInput;

          if (config._d) {
              return;
          }

          normalizedInput = normalizeObjectUnits(config._i);
          config._a = [
              normalizedInput.year,
              normalizedInput.month,
              normalizedInput.day,
              normalizedInput.hour,
              normalizedInput.minute,
              normalizedInput.second,
              normalizedInput.millisecond
          ];

          dateFromConfig(config);
      }

      function currentDateArray(config) {
          var now = new Date();
          if (config._useUTC) {
              return [
                  now.getUTCFullYear(),
                  now.getUTCMonth(),
                  now.getUTCDate()
              ];
          } else {
              return [now.getFullYear(), now.getMonth(), now.getDate()];
          }
      }

      // date from string and format string
      function makeDateFromStringAndFormat(config) {

          config._a = [];
          config._pf.empty = true;

          // This array is used to make a Date, either with `new Date` or `Date.UTC`
          var lang = getLangDefinition(config._l),
              string = '' + config._i,
              i, parsedInput, tokens, token, skipped,
              stringLength = string.length,
              totalParsedInputLength = 0;

          tokens = expandFormat(config._f, lang).match(formattingTokens) || [];

          for (i = 0; i < tokens.length; i++) {
              token = tokens[i];
              parsedInput = (string.match(getParseRegexForToken(token, config)) || [])[0];
              if (parsedInput) {
                  skipped = string.substr(0, string.indexOf(parsedInput));
                  if (skipped.length > 0) {
                      config._pf.unusedInput.push(skipped);
                  }
                  string = string.slice(string.indexOf(parsedInput) + parsedInput.length);
                  totalParsedInputLength += parsedInput.length;
              }
              // don't parse if it's not a known token
              if (formatTokenFunctions[token]) {
                  if (parsedInput) {
                      config._pf.empty = false;
                  }
                  else {
                      config._pf.unusedTokens.push(token);
                  }
                  addTimeToArrayFromToken(token, parsedInput, config);
              }
              else if (config._strict && !parsedInput) {
                  config._pf.unusedTokens.push(token);
              }
          }

          // add remaining unparsed input length to the string
          config._pf.charsLeftOver = stringLength - totalParsedInputLength;
          if (string.length > 0) {
              config._pf.unusedInput.push(string);
          }

          // handle am pm
          if (config._isPm && config._a[HOUR] < 12) {
              config._a[HOUR] += 12;
          }
          // if is 12 am, change hours to 0
          if (config._isPm === false && config._a[HOUR] === 12) {
              config._a[HOUR] = 0;
          }

          dateFromConfig(config);
          checkOverflow(config);
      }

      function unescapeFormat(s) {
          return s.replace(/\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g, function (matched, p1, p2, p3, p4) {
              return p1 || p2 || p3 || p4;
          });
      }

      // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
      function regexpEscape(s) {
          return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
      }

      // date from string and array of format strings
      function makeDateFromStringAndArray(config) {
          var tempConfig,
              bestMoment,

              scoreToBeat,
              i,
              currentScore;

          if (config._f.length === 0) {
              config._pf.invalidFormat = true;
              config._d = new Date(NaN);
              return;
          }

          for (i = 0; i < config._f.length; i++) {
              currentScore = 0;
              tempConfig = extend({}, config);
              tempConfig._pf = defaultParsingFlags();
              tempConfig._f = config._f[i];
              makeDateFromStringAndFormat(tempConfig);

              if (!isValid(tempConfig)) {
                  continue;
              }

              // if there is any input that was not parsed add a penalty for that format
              currentScore += tempConfig._pf.charsLeftOver;

              //or tokens
              currentScore += tempConfig._pf.unusedTokens.length * 10;

              tempConfig._pf.score = currentScore;

              if (scoreToBeat == null || currentScore < scoreToBeat) {
                  scoreToBeat = currentScore;
                  bestMoment = tempConfig;
              }
          }

          extend(config, bestMoment || tempConfig);
      }

      // date from iso format
      function makeDateFromString(config) {
          var i, l,
              string = config._i,
              match = isoRegex.exec(string);

          if (match) {
              config._pf.iso = true;
              for (i = 0, l = isoDates.length; i < l; i++) {
                  if (isoDates[i][1].exec(string)) {
                      // match[5] should be "T" or undefined
                      config._f = isoDates[i][0] + (match[6] || " ");
                      break;
                  }
              }
              for (i = 0, l = isoTimes.length; i < l; i++) {
                  if (isoTimes[i][1].exec(string)) {
                      config._f += isoTimes[i][0];
                      break;
                  }
              }
              if (string.match(parseTokenTimezone)) {
                  config._f += "Z";
              }
              makeDateFromStringAndFormat(config);
          }
          else {
              config._d = new Date(string);
          }
      }

      function makeDateFromInput(config) {
          var input = config._i,
              matched = aspNetJsonRegex.exec(input);

          if (input === undefined) {
              config._d = new Date();
          } else if (matched) {
              config._d = new Date(+matched[1]);
          } else if (typeof input === 'string') {
              makeDateFromString(config);
          } else if (isArray(input)) {
              config._a = input.slice(0);
              dateFromConfig(config);
          } else if (isDate(input)) {
              config._d = new Date(+input);
          } else if (typeof(input) === 'object') {
              dateFromObject(config);
          } else {
              config._d = new Date(input);
          }
      }

      function makeDate(y, m, d, h, M, s, ms) {
          //can't just apply() to create a date:
          //http://stackoverflow.com/questions/181348/instantiating-a-javascript-object-by-calling-prototype-constructor-apply
          var date = new Date(y, m, d, h, M, s, ms);

          //the date constructor doesn't accept years < 1970
          if (y < 1970) {
              date.setFullYear(y);
          }
          return date;
      }

      function makeUTCDate(y) {
          var date = new Date(Date.UTC.apply(null, arguments));
          if (y < 1970) {
              date.setUTCFullYear(y);
          }
          return date;
      }

      function parseWeekday(input, language) {
          if (typeof input === 'string') {
              if (!isNaN(input)) {
                  input = parseInt(input, 10);
              }
              else {
                  input = language.weekdaysParse(input);
                  if (typeof input !== 'number') {
                      return null;
                  }
              }
          }
          return input;
      }

      /************************************
          Relative Time
      ************************************/


      // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize
      function substituteTimeAgo(string, number, withoutSuffix, isFuture, lang) {
          return lang.relativeTime(number || 1, !!withoutSuffix, string, isFuture);
      }

      function relativeTime(milliseconds, withoutSuffix, lang) {
          var seconds = round(Math.abs(milliseconds) / 1000),
              minutes = round(seconds / 60),
              hours = round(minutes / 60),
              days = round(hours / 24),
              years = round(days / 365),
              args = seconds < 45 && ['s', seconds] ||
                  minutes === 1 && ['m'] ||
                  minutes < 45 && ['mm', minutes] ||
                  hours === 1 && ['h'] ||
                  hours < 22 && ['hh', hours] ||
                  days === 1 && ['d'] ||
                  days <= 25 && ['dd', days] ||
                  days <= 45 && ['M'] ||
                  days < 345 && ['MM', round(days / 30)] ||
                  years === 1 && ['y'] || ['yy', years];
          args[2] = withoutSuffix;
          args[3] = milliseconds > 0;
          args[4] = lang;
          return substituteTimeAgo.apply({}, args);
      }


      /************************************
          Week of Year
      ************************************/


      // firstDayOfWeek       0 = sun, 6 = sat
      //                      the day of the week that starts the week
      //                      (usually sunday or monday)
      // firstDayOfWeekOfYear 0 = sun, 6 = sat
      //                      the first week is the week that contains the first
      //                      of this day of the week
      //                      (eg. ISO weeks use thursday (4))
      function weekOfYear(mom, firstDayOfWeek, firstDayOfWeekOfYear) {
          var end = firstDayOfWeekOfYear - firstDayOfWeek,
              daysToDayOfWeek = firstDayOfWeekOfYear - mom.day(),
              adjustedMoment;


          if (daysToDayOfWeek > end) {
              daysToDayOfWeek -= 7;
          }

          if (daysToDayOfWeek < end - 7) {
              daysToDayOfWeek += 7;
          }

          adjustedMoment = moment(mom).add('d', daysToDayOfWeek);
          return {
              week: Math.ceil(adjustedMoment.dayOfYear() / 7),
              year: adjustedMoment.year()
          };
      }

      //http://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday
      function dayOfYearFromWeeks(year, week, weekday, firstDayOfWeekOfYear, firstDayOfWeek) {
          var d = makeUTCDate(year, 0, 1).getUTCDay(), daysToAdd, dayOfYear;

          weekday = weekday != null ? weekday : firstDayOfWeek;
          daysToAdd = firstDayOfWeek - d + (d > firstDayOfWeekOfYear ? 7 : 0) - (d < firstDayOfWeek ? 7 : 0);
          dayOfYear = 7 * (week - 1) + (weekday - firstDayOfWeek) + daysToAdd + 1;

          return {
              year: dayOfYear > 0 ? year : year - 1,
              dayOfYear: dayOfYear > 0 ?  dayOfYear : daysInYear(year - 1) + dayOfYear
          };
      }

      /************************************
          Top Level Functions
      ************************************/

      function makeMoment(config) {
          var input = config._i,
              format = config._f;

          if (input === null) {
              return moment.invalid({nullInput: true});
          }

          if (typeof input === 'string') {
              config._i = input = getLangDefinition().preparse(input);
          }

          if (moment.isMoment(input)) {
              config = cloneMoment(input);

              config._d = new Date(+input._d);
          } else if (format) {
              if (isArray(format)) {
                  makeDateFromStringAndArray(config);
              } else {
                  makeDateFromStringAndFormat(config);
              }
          } else {
              makeDateFromInput(config);
          }

          return new Moment(config);
      }

      moment = function (input, format, lang, strict) {
          var c;

          if (typeof(lang) === "boolean") {
              strict = lang;
              lang = undefined;
          }
          // object construction must be done this way.
          // https://github.com/moment/moment/issues/1423
          c = {};
          c._isAMomentObject = true;
          c._i = input;
          c._f = format;
          c._l = lang;
          c._strict = strict;
          c._isUTC = false;
          c._pf = defaultParsingFlags();

          return makeMoment(c);
      };

      // creating with utc
      moment.utc = function (input, format, lang, strict) {
          var c;

          if (typeof(lang) === "boolean") {
              strict = lang;
              lang = undefined;
          }
          // object construction must be done this way.
          // https://github.com/moment/moment/issues/1423
          c = {};
          c._isAMomentObject = true;
          c._useUTC = true;
          c._isUTC = true;
          c._l = lang;
          c._i = input;
          c._f = format;
          c._strict = strict;
          c._pf = defaultParsingFlags();

          return makeMoment(c).utc();
      };

      // creating with unix timestamp (in seconds)
      moment.unix = function (input) {
          return moment(input * 1000);
      };

      // duration
      moment.duration = function (input, key) {
          var duration = input,
              // matching against regexp is expensive, do it on demand
              match = null,
              sign,
              ret,
              parseIso;

          if (moment.isDuration(input)) {
              duration = {
                  ms: input._milliseconds,
                  d: input._days,
                  M: input._months
              };
          } else if (typeof input === 'number') {
              duration = {};
              if (key) {
                  duration[key] = input;
              } else {
                  duration.milliseconds = input;
              }
          } else if (!!(match = aspNetTimeSpanJsonRegex.exec(input))) {
              sign = (match[1] === "-") ? -1 : 1;
              duration = {
                  y: 0,
                  d: toInt(match[DATE]) * sign,
                  h: toInt(match[HOUR]) * sign,
                  m: toInt(match[MINUTE]) * sign,
                  s: toInt(match[SECOND]) * sign,
                  ms: toInt(match[MILLISECOND]) * sign
              };
          } else if (!!(match = isoDurationRegex.exec(input))) {
              sign = (match[1] === "-") ? -1 : 1;
              parseIso = function (inp) {
                  // We'd normally use ~~inp for this, but unfortunately it also
                  // converts floats to ints.
                  // inp may be undefined, so careful calling replace on it.
                  var res = inp && parseFloat(inp.replace(',', '.'));
                  // apply sign while we're at it
                  return (isNaN(res) ? 0 : res) * sign;
              };
              duration = {
                  y: parseIso(match[2]),
                  M: parseIso(match[3]),
                  d: parseIso(match[4]),
                  h: parseIso(match[5]),
                  m: parseIso(match[6]),
                  s: parseIso(match[7]),
                  w: parseIso(match[8])
              };
          }

          ret = new Duration(duration);

          if (moment.isDuration(input) && input.hasOwnProperty('_lang')) {
              ret._lang = input._lang;
          }

          return ret;
      };

      // version number
      moment.version = VERSION;

      // default format
      moment.defaultFormat = isoFormat;

      // This function will be called whenever a moment is mutated.
      // It is intended to keep the offset in sync with the timezone.
      moment.updateOffset = function () {};

      // This function will load languages and then set the global language.  If
      // no arguments are passed in, it will simply return the current global
      // language key.
      moment.lang = function (key, values) {
          var r;
          if (!key) {
              return moment.fn._lang._abbr;
          }
          if (values) {
              loadLang(normalizeLanguage(key), values);
          } else if (values === null) {
              unloadLang(key);
              key = 'en';
          } else if (!languages[key]) {
              getLangDefinition(key);
          }
          r = moment.duration.fn._lang = moment.fn._lang = getLangDefinition(key);
          return r._abbr;
      };

      // returns language data
      moment.langData = function (key) {
          if (key && key._lang && key._lang._abbr) {
              key = key._lang._abbr;
          }
          return getLangDefinition(key);
      };

      // compare moment object
      moment.isMoment = function (obj) {
          return obj instanceof Moment ||
              (obj != null &&  obj.hasOwnProperty('_isAMomentObject'));
      };

      // for typechecking Duration objects
      moment.isDuration = function (obj) {
          return obj instanceof Duration;
      };

      for (i = lists.length - 1; i >= 0; --i) {
          makeList(lists[i]);
      }

      moment.normalizeUnits = function (units) {
          return normalizeUnits(units);
      };

      moment.invalid = function (flags) {
          var m = moment.utc(NaN);
          if (flags != null) {
              extend(m._pf, flags);
          }
          else {
              m._pf.userInvalidated = true;
          }

          return m;
      };

      moment.parseZone = function (input) {
          return moment(input).parseZone();
      };

      /************************************
          Moment Prototype
      ************************************/


      extend(moment.fn = Moment.prototype, {

          clone : function () {
              return moment(this);
          },

          valueOf : function () {
              return +this._d + ((this._offset || 0) * 60000);
          },

          unix : function () {
              return Math.floor(+this / 1000);
          },

          toString : function () {
              return this.clone().lang('en').format("ddd MMM DD YYYY HH:mm:ss [GMT]ZZ");
          },

          toDate : function () {
              return this._offset ? new Date(+this) : this._d;
          },

          toISOString : function () {
              var m = moment(this).utc();
              if (0 < m.year() && m.year() <= 9999) {
                  return formatMoment(m, 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]');
              } else {
                  return formatMoment(m, 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]');
              }
          },

          toArray : function () {
              var m = this;
              return [
                  m.year(),
                  m.month(),
                  m.date(),
                  m.hours(),
                  m.minutes(),
                  m.seconds(),
                  m.milliseconds()
              ];
          },

          isValid : function () {
              return isValid(this);
          },

          isDSTShifted : function () {

              if (this._a) {
                  return this.isValid() && compareArrays(this._a, (this._isUTC ? moment.utc(this._a) : moment(this._a)).toArray()) > 0;
              }

              return false;
          },

          parsingFlags : function () {
              return extend({}, this._pf);
          },

          invalidAt: function () {
              return this._pf.overflow;
          },

          utc : function () {
              return this.zone(0);
          },

          local : function () {
              this.zone(0);
              this._isUTC = false;
              return this;
          },

          format : function (inputString) {
              var output = formatMoment(this, inputString || moment.defaultFormat);
              return this.lang().postformat(output);
          },

          add : function (input, val) {
              var dur;
              // switch args to support add('s', 1) and add(1, 's')
              if (typeof input === 'string') {
                  dur = moment.duration(+val, input);
              } else {
                  dur = moment.duration(input, val);
              }
              addOrSubtractDurationFromMoment(this, dur, 1);
              return this;
          },

          subtract : function (input, val) {
              var dur;
              // switch args to support subtract('s', 1) and subtract(1, 's')
              if (typeof input === 'string') {
                  dur = moment.duration(+val, input);
              } else {
                  dur = moment.duration(input, val);
              }
              addOrSubtractDurationFromMoment(this, dur, -1);
              return this;
          },

          diff : function (input, units, asFloat) {
              var that = makeAs(input, this),
                  zoneDiff = (this.zone() - that.zone()) * 6e4,
                  diff, output;

              units = normalizeUnits(units);

              if (units === 'year' || units === 'month') {
                  // average number of days in the months in the given dates
                  diff = (this.daysInMonth() + that.daysInMonth()) * 432e5; // 24 * 60 * 60 * 1000 / 2
                  // difference in months
                  output = ((this.year() - that.year()) * 12) + (this.month() - that.month());
                  // adjust by taking difference in days, average number of days
                  // and dst in the given months.
                  output += ((this - moment(this).startOf('month')) -
                          (that - moment(that).startOf('month'))) / diff;
                  // same as above but with zones, to negate all dst
                  output -= ((this.zone() - moment(this).startOf('month').zone()) -
                          (that.zone() - moment(that).startOf('month').zone())) * 6e4 / diff;
                  if (units === 'year') {
                      output = output / 12;
                  }
              } else {
                  diff = (this - that);
                  output = units === 'second' ? diff / 1e3 : // 1000
                      units === 'minute' ? diff / 6e4 : // 1000 * 60
                      units === 'hour' ? diff / 36e5 : // 1000 * 60 * 60
                      units === 'day' ? (diff - zoneDiff) / 864e5 : // 1000 * 60 * 60 * 24, negate dst
                      units === 'week' ? (diff - zoneDiff) / 6048e5 : // 1000 * 60 * 60 * 24 * 7, negate dst
                      diff;
              }
              return asFloat ? output : absRound(output);
          },

          from : function (time, withoutSuffix) {
              return moment.duration(this.diff(time)).lang(this.lang()._abbr).humanize(!withoutSuffix);
          },

          fromNow : function (withoutSuffix) {
              return this.from(moment(), withoutSuffix);
          },

          calendar : function () {
              // We want to compare the start of today, vs this.
              // Getting start-of-today depends on whether we're zone'd or not.
              var sod = makeAs(moment(), this).startOf('day'),
                  diff = this.diff(sod, 'days', true),
                  format = diff < -6 ? 'sameElse' :
                      diff < -1 ? 'lastWeek' :
                      diff < 0 ? 'lastDay' :
                      diff < 1 ? 'sameDay' :
                      diff < 2 ? 'nextDay' :
                      diff < 7 ? 'nextWeek' : 'sameElse';
              return this.format(this.lang().calendar(format, this));
          },

          isLeapYear : function () {
              return isLeapYear(this.year());
          },

          isDST : function () {
              return (this.zone() < this.clone().month(0).zone() ||
                  this.zone() < this.clone().month(5).zone());
          },

          day : function (input) {
              var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay();
              if (input != null) {
                  input = parseWeekday(input, this.lang());
                  return this.add({ d : input - day });
              } else {
                  return day;
              }
          },

          month : function (input) {
              var utc = this._isUTC ? 'UTC' : '',
                  dayOfMonth;

              if (input != null) {
                  if (typeof input === 'string') {
                      input = this.lang().monthsParse(input);
                      if (typeof input !== 'number') {
                          return this;
                      }
                  }

                  dayOfMonth = this.date();
                  this.date(1);
                  this._d['set' + utc + 'Month'](input);
                  this.date(Math.min(dayOfMonth, this.daysInMonth()));

                  moment.updateOffset(this);
                  return this;
              } else {
                  return this._d['get' + utc + 'Month']();
              }
          },

          startOf: function (units) {
              units = normalizeUnits(units);
              // the following switch intentionally omits break keywords
              // to utilize falling through the cases.
              switch (units) {
              case 'year':
                  this.month(0);
                  /* falls through */
              case 'month':
                  this.date(1);
                  /* falls through */
              case 'week':
              case 'isoWeek':
              case 'day':
                  this.hours(0);
                  /* falls through */
              case 'hour':
                  this.minutes(0);
                  /* falls through */
              case 'minute':
                  this.seconds(0);
                  /* falls through */
              case 'second':
                  this.milliseconds(0);
                  /* falls through */
              }

              // weeks are a special case
              if (units === 'week') {
                  this.weekday(0);
              } else if (units === 'isoWeek') {
                  this.isoWeekday(1);
              }

              return this;
          },

          endOf: function (units) {
              units = normalizeUnits(units);
              return this.startOf(units).add((units === 'isoWeek' ? 'week' : units), 1).subtract('ms', 1);
          },

          isAfter: function (input, units) {
              units = typeof units !== 'undefined' ? units : 'millisecond';
              return +this.clone().startOf(units) > +moment(input).startOf(units);
          },

          isBefore: function (input, units) {
              units = typeof units !== 'undefined' ? units : 'millisecond';
              return +this.clone().startOf(units) < +moment(input).startOf(units);
          },

          isSame: function (input, units) {
              units = units || 'ms';
              return +this.clone().startOf(units) === +makeAs(input, this).startOf(units);
          },

          min: function (other) {
              other = moment.apply(null, arguments);
              return other < this ? this : other;
          },

          max: function (other) {
              other = moment.apply(null, arguments);
              return other > this ? this : other;
          },

          zone : function (input) {
              var offset = this._offset || 0;
              if (input != null) {
                  if (typeof input === "string") {
                      input = timezoneMinutesFromString(input);
                  }
                  if (Math.abs(input) < 16) {
                      input = input * 60;
                  }
                  this._offset = input;
                  this._isUTC = true;
                  if (offset !== input) {
                      addOrSubtractDurationFromMoment(this, moment.duration(offset - input, 'm'), 1, true);
                  }
              } else {
                  return this._isUTC ? offset : this._d.getTimezoneOffset();
              }
              return this;
          },

          zoneAbbr : function () {
              return this._isUTC ? "UTC" : "";
          },

          zoneName : function () {
              return this._isUTC ? "Coordinated Universal Time" : "";
          },

          parseZone : function () {
              if (this._tzm) {
                  this.zone(this._tzm);
              } else if (typeof this._i === 'string') {
                  this.zone(this._i);
              }
              return this;
          },

          hasAlignedHourOffset : function (input) {
              if (!input) {
                  input = 0;
              }
              else {
                  input = moment(input).zone();
              }

              return (this.zone() - input) % 60 === 0;
          },

          daysInMonth : function () {
              return daysInMonth(this.year(), this.month());
          },

          dayOfYear : function (input) {
              var dayOfYear = round((moment(this).startOf('day') - moment(this).startOf('year')) / 864e5) + 1;
              return input == null ? dayOfYear : this.add("d", (input - dayOfYear));
          },

          quarter : function () {
              return Math.ceil((this.month() + 1.0) / 3.0);
          },

          weekYear : function (input) {
              var year = weekOfYear(this, this.lang()._week.dow, this.lang()._week.doy).year;
              return input == null ? year : this.add("y", (input - year));
          },

          isoWeekYear : function (input) {
              var year = weekOfYear(this, 1, 4).year;
              return input == null ? year : this.add("y", (input - year));
          },

          week : function (input) {
              var week = this.lang().week(this);
              return input == null ? week : this.add("d", (input - week) * 7);
          },

          isoWeek : function (input) {
              var week = weekOfYear(this, 1, 4).week;
              return input == null ? week : this.add("d", (input - week) * 7);
          },

          weekday : function (input) {
              var weekday = (this.day() + 7 - this.lang()._week.dow) % 7;
              return input == null ? weekday : this.add("d", input - weekday);
          },

          isoWeekday : function (input) {
              // behaves the same as moment#day except
              // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
              // as a setter, sunday should belong to the previous week.
              return input == null ? this.day() || 7 : this.day(this.day() % 7 ? input : input - 7);
          },

          get : function (units) {
              units = normalizeUnits(units);
              return this[units]();
          },

          set : function (units, value) {
              units = normalizeUnits(units);
              if (typeof this[units] === 'function') {
                  this[units](value);
              }
              return this;
          },

          // If passed a language key, it will set the language for this
          // instance.  Otherwise, it will return the language configuration
          // variables for this instance.
          lang : function (key) {
              if (key === undefined) {
                  return this._lang;
              } else {
                  this._lang = getLangDefinition(key);
                  return this;
              }
          }
      });

      // helper for adding shortcuts
      function makeGetterAndSetter(name, key) {
          moment.fn[name] = moment.fn[name + 's'] = function (input) {
              var utc = this._isUTC ? 'UTC' : '';
              if (input != null) {
                  this._d['set' + utc + key](input);
                  moment.updateOffset(this);
                  return this;
              } else {
                  return this._d['get' + utc + key]();
              }
          };
      }

      // loop through and add shortcuts (Month, Date, Hours, Minutes, Seconds, Milliseconds)
      for (i = 0; i < proxyGettersAndSetters.length; i ++) {
          makeGetterAndSetter(proxyGettersAndSetters[i].toLowerCase().replace(/s$/, ''), proxyGettersAndSetters[i]);
      }

      // add shortcut for year (uses different syntax than the getter/setter 'year' == 'FullYear')
      makeGetterAndSetter('year', 'FullYear');

      // add plural methods
      moment.fn.days = moment.fn.day;
      moment.fn.months = moment.fn.month;
      moment.fn.weeks = moment.fn.week;
      moment.fn.isoWeeks = moment.fn.isoWeek;

      // add aliased format methods
      moment.fn.toJSON = moment.fn.toISOString;

      /************************************
          Duration Prototype
      ************************************/


      extend(moment.duration.fn = Duration.prototype, {

          _bubble : function () {
              var milliseconds = this._milliseconds,
                  days = this._days,
                  months = this._months,
                  data = this._data,
                  seconds, minutes, hours, years;

              // The following code bubbles up values, see the tests for
              // examples of what that means.
              data.milliseconds = milliseconds % 1000;

              seconds = absRound(milliseconds / 1000);
              data.seconds = seconds % 60;

              minutes = absRound(seconds / 60);
              data.minutes = minutes % 60;

              hours = absRound(minutes / 60);
              data.hours = hours % 24;

              days += absRound(hours / 24);
              data.days = days % 30;

              months += absRound(days / 30);
              data.months = months % 12;

              years = absRound(months / 12);
              data.years = years;
          },

          weeks : function () {
              return absRound(this.days() / 7);
          },

          valueOf : function () {
              return this._milliseconds +
                this._days * 864e5 +
                (this._months % 12) * 2592e6 +
                toInt(this._months / 12) * 31536e6;
          },

          humanize : function (withSuffix) {
              var difference = +this,
                  output = relativeTime(difference, !withSuffix, this.lang());

              if (withSuffix) {
                  output = this.lang().pastFuture(difference, output);
              }

              return this.lang().postformat(output);
          },

          add : function (input, val) {
              // supports only 2.0-style add(1, 's') or add(moment)
              var dur = moment.duration(input, val);

              this._milliseconds += dur._milliseconds;
              this._days += dur._days;
              this._months += dur._months;

              this._bubble();

              return this;
          },

          subtract : function (input, val) {
              var dur = moment.duration(input, val);

              this._milliseconds -= dur._milliseconds;
              this._days -= dur._days;
              this._months -= dur._months;

              this._bubble();

              return this;
          },

          get : function (units) {
              units = normalizeUnits(units);
              return this[units.toLowerCase() + 's']();
          },

          as : function (units) {
              units = normalizeUnits(units);
              return this['as' + units.charAt(0).toUpperCase() + units.slice(1) + 's']();
          },

          lang : moment.fn.lang,

          toIsoString : function () {
              // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js
              var years = Math.abs(this.years()),
                  months = Math.abs(this.months()),
                  days = Math.abs(this.days()),
                  hours = Math.abs(this.hours()),
                  minutes = Math.abs(this.minutes()),
                  seconds = Math.abs(this.seconds() + this.milliseconds() / 1000);

              if (!this.asSeconds()) {
                  // this is the same as C#'s (Noda) and python (isodate)...
                  // but not other JS (goog.date)
                  return 'P0D';
              }

              return (this.asSeconds() < 0 ? '-' : '') +
                  'P' +
                  (years ? years + 'Y' : '') +
                  (months ? months + 'M' : '') +
                  (days ? days + 'D' : '') +
                  ((hours || minutes || seconds) ? 'T' : '') +
                  (hours ? hours + 'H' : '') +
                  (minutes ? minutes + 'M' : '') +
                  (seconds ? seconds + 'S' : '');
          }
      });

      function makeDurationGetter(name) {
          moment.duration.fn[name] = function () {
              return this._data[name];
          };
      }

      function makeDurationAsGetter(name, factor) {
          moment.duration.fn['as' + name] = function () {
              return +this / factor;
          };
      }

      for (i in unitMillisecondFactors) {
          if (unitMillisecondFactors.hasOwnProperty(i)) {
              makeDurationAsGetter(i, unitMillisecondFactors[i]);
              makeDurationGetter(i.toLowerCase());
          }
      }

      makeDurationAsGetter('Weeks', 6048e5);
      moment.duration.fn.asMonths = function () {
          return (+this - this.years() * 31536e6) / 2592e6 + this.years() * 12;
      };


      /************************************
          Default Lang
      ************************************/


      // Set default language, other languages will inherit from English.
      moment.lang('en', {
          ordinal : function (number) {
              var b = number % 10,
                  output = (toInt(number % 100 / 10) === 1) ? 'th' :
                  (b === 1) ? 'st' :
                  (b === 2) ? 'nd' :
                  (b === 3) ? 'rd' : 'th';
              return number + output;
          }
      });

      /* EMBED_LANGUAGES */

      /************************************
          Exposing Moment
      ************************************/

      function makeGlobal(deprecate) {
          var warned = false, local_moment = moment;
          /*global ender:false */
          if (typeof ender !== 'undefined') {
              return;
          }
          // here, `this` means `window` in the browser, or `global` on the server
          // add `moment` as a global object via a string identifier,
          // for Closure Compiler "advanced" mode
          if (deprecate) {
              global.moment = function () {
                  return local_moment.apply(null, arguments);
              };
              extend(global.moment, local_moment);
          } else {
              global['moment'] = moment;
          }
      }

      // CommonJS module is defined
      if (hasModule) {
          module.exports = moment;
          makeGlobal(true);
      } else if (typeof define === "function" && define.amd) {
          define("moment", function (require, exports, module) {
              if (module.config && module.config() && module.config().noGlobal !== true) {
                  // If user provided noGlobal, he is aware of global
                  makeGlobal(module.config().noGlobal === undefined);
              }

              return moment;
          });
      } else {
          makeGlobal();
      }
  }).call(this);
 });